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Using ultrasound dispersing, high silicon carbide powders ball grinding method in introducing Al2O3 - Y2O3 sintering additives, preparation for sintering sic ceramics. Through the research of different levels and in different proportion of sintering additives on the properties of silicon carbide ceramics, time of sintering influences the performance of sic ceramics and milling time of sic ceramics, finally the appropriate process parameters, the preparation of high silicon carbide ceramic.

Using ball mill.the silicon carbide ceramic powders were prepared for precursors, precursor powders were thermogravimetric analysis, ir, differential thermal analysis, powder diffraction analysis indicates that the precursor powder sintering obtained Al2O3 auxiliaries Y2O3 and formation of about 9.6 yag.the temperature degrees. Through the analysis of sintering, extend and improve the sintering temperature sintering time improve sinter density, increase the temperature of the increase of density is more effective. Analysis of sinter ball grinding time performance, that the appropriate milling time for 12h. Composite powder sinter ball grinding method of sintered body for the general density 3.16 g/cm - 3, relative density 96%. Through the analysis of sinter, SEM sintered surface porosity above section, and surface of grain boundaries, basic "clean" is more obvious than in dense, section.

二挑一

In this paper, the use of ultrasonic dispersion, high-energy ball milling of silicon carbide powder in the introduction of Al2O3-Y2O3 sintering aids were prepared by sintering silicon carbide ceramics. By studying the content in different proportions and different sintering additives on the properties of silicon carbide ceramic, sintering time on properties of silicon carbide ceramic and ceramic milling time on properties of silicon carbide, and finally determine the appropriate process parameters, preparation of high-performance of silicon carbide ceramics.

Prepared using ball milling of silicon carbide ceramic precursor powders, the precursor powders were TG, differential thermal analysis, IR analysis, powder diffraction analysis, show that the precursor powders obtained in Al2O3 and Y2O3 sintering aids the formation of the temperature of YAG about 960 ℃. Through the sintering of the analysis show that the extension of sintering time and improve the sintering temperature are to improve the sintered density, improve temperature on density is more effective improvement. Analysis of milling time on properties of sintered bodies, indicating that a suitable milling time for 12h. Ball milling to obtain the composite powder sintered body sintered density of the largest 3.16g/cm-3, the relative density of 96.0%. Sintered by the SEM analysis, show that the sintered porosity of the surface above the cross-section, cross-section of the grain surface and the basic "clean" grain boundaries are more obvious than dense cross-section surface

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